3 Answers
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The Ubertooth one will allow you to sniff bluetooth traffic. It is fully capable of being placed into monitor mode and can be used with tools such as Kismet to perform bluetooth sniffing. There may be additional functionality that will allow you to perform packet injection as well. However if the traffic is encrypted this may not allow you to see the packets in the clear but it may give you a good start at reverse engineering the communication protocols.

Perhaps instead of intercepting the bluetooth communication and decoding it, it might actually be easier to decompile the closed-source app and then search for the bluetooth commands? The control devices might use a standard bluetooth library that you might be able to hook into and log all requests/responses somehow?